To what extent are the following computer systems instances of artificial intelligence: a. Supermarket bar code scanners. b. Web search engines.

Artificial Intelligence-It talks about the creation and usage  of intelligent machines which can eliminate errors caused by human.In simple words it replaces human intelligence

Explanation:

A Supermarket bar code is a set of characters which are encoded in black and white markings ,so that it can be for a machine to scanned via machine or scanner.A Scanner consist of three parts-Lighting system,sensor and decoder.The pulse width of the scanned bars is detected then a simple logic equation is applied to the detected pulse in order to encode the bar code.Thus, no AI technology is being used in Supermarket bar code.In Web Search Engines-The search engines rely on many algorithms to create search results for search queries.Thus the web search engine rely heavily on artificial intelligence.For example: RankBrain Artificial intelligence technology used by Google search engine.